#!coding:utf-8
import torch
import torch.nn as nn
import torch.nn.functional as F

class BasicBlock(nn.Module):
    expansion = 1

    def __init__(self, in_planes, planes, stride=1):
        super(BasicBlock, self).__init__()
        self.conv1 = nn.Conv2d(in_planes, planes, kernel_size=3, stride=stride, padding=1, bias=False)
        self.bn1 = nn.BatchNorm2d(planes)
        self.conv2 = nn.Conv2d(planes, planes, kernel_size=3, stride=1, padding=1, bias=False)
        self.bn2 = nn.BatchNorm2d(planes)

        self.shortcut = nn.Sequential()
        if stride!=1 or in_planes!=self.expansion*planes:
            self.shortcut = nn.Sequential(
                    nn.Conv2d(in_planes, self.expansion*planes, kernel_size=1, stride=stride, bias=False),
                    nn.BatchNorm2d(self.expansion*planes)
            )

    def forward(self, x):
        out = F.relu(self.bn1(self.conv1(x)))
        out = self.bn2(self.conv2(out))
        out += self.shortcut(x)
        return F.relu(out)

class Bottleneck(nn.Module):
    expansion = 4

    def __init__(self, in_planes, planes, stride=1):
        super(Bottleneck, self).__init__()
        self.conv1 = nn.Conv2d(in_planes, planes, kernel_size=1, bias=False)
        self.bn1 = nn.BatchNorm2d(planes)
        self.conv2 = nn.Conv2d(planes, planes, kernel_size=3, stride=stride, padding=1, bias=False)
        self.bn2 = nn.BatchNorm2d(planes)
        self.conv3 = nn.Conv2d(planes, self.expansion*planes, kernel_size=1, bias=False)
        self.bn3 = nn.BatchNorm2d(self.expansion*planes)

        self.shortcut = nn.Sequential()
        if stride!=1 or in_planes!=self.expansion*planes:
            self.shortcut = nn.Sequential(
                    nn.Conv2d(in_planes, self.expansion*planes, kernel_size=1, stride=stride, bias=False),
                    nn.BatchNorm2d(self.expansion*planes)
            )

    def forward(self, x):
        out = F.relu(self.bn1(self.conv1(x)))
        out = F.relu(self.bn2(self.conv2(out)))
        out = self.bn3(self.conv3(out))
        out += self.shortcut(x)
        return F.relu(out)

class ResNet(nn.Module):
    
    def __init__(self, block, num_blocks, num_classes):
        super(ResNet, self).__init__()
        self.in_planes = 64

        self.conv1 = nn.Conv2d(3, 64, kernel_size=3, stride=1, padding=1, bias=False)
        self.bn1 = nn.BatchNorm2d(64)
        self.layer1 = self._make_layer(block, 64, num_blocks[0], stride=1)
        self.layer2 = self._make_layer(block, 128, num_blocks[1], stride=2)
        self.layer3 = self._make_layer(block, 256, num_blocks[2], stride=2)
        self.layer4 = self._make_layer(block, 512, num_blocks[3], stride=2)
        self.fc1 = nn.Linear(512*block.expansion, num_classes)

    def _make_layer(self, block, planes, num_blocks, stride):
        strides = [stride] + [1]*(num_blocks-1)
        layers = []
        for stride in strides:
            layers.append(block(self.in_planes, planes, stride))
            self.in_planes = planes * block.expansion
        return nn.Sequential(*layers)

    def forward(self, x):
        out = F.relu(self.bn1(self.conv1(x)))
        out = self.layer1(out)
        out = self.layer2(out)
        out = self.layer3(out)
        out = self.layer4(out)
        out = F.avg_pool2d(out, 4)
        out = out.view(out.size(0), -1)
        return self.fc1(out), out

def ResNet18(num_classes):
    return ResNet(BasicBlock, [2,2,2,2], num_classes)

def ResNet34(num_classes):
    return ResNet(BasicBlock, [3,4,6,3], num_classes)

def ResNet50(num_classes):
    return ResNet(Bottleneck, [3,4,6,3], num_classes)

def ResNet101(num_classes):
    return ResNet(Bottleneck, [3,4,23,3], num_classes)

def ResNet152(num_classes):
    return ResNet(BasicBlock, [2,2,2,2], num_classes)

def test():
    print('--- run resnet test ---')
    x = torch.randn(2,3,32,32)
    for net in [ResNet18(10), ResNet34(10), ResNet50(10), ResNet101(10), ResNet152(10)]:
        print(net)
        y = net(x)
        print(y.size())
